<!--
 * User: CHT
 * Date: 2020/6/28
 * Time: 17:48
-->
<template>
  <div>
    <div>
      <el-form class="link-base-style-form" ref="linkBaseStyle" label-width="100px" @submit.native.prevent
        :model="linkBaseStyle">
        <h4>linkBaseStyle (连线的样式定制)</h4>
        <el-row :gutter="10">
          <el-col :span="12">
            <el-form-item label="color">
              <el-color-picker v-model="linkBaseStyle.color">
              </el-color-picker>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="hover">
              <el-color-picker v-model="linkBaseStyle.hover">
              </el-color-picker>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="textColor">
              <el-color-picker v-model="linkBaseStyle.textColor">
              </el-color-picker>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="textHover">
              <el-color-picker v-model="linkBaseStyle.textHover">
              </el-color-picker>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="font">
              <el-select size="medium" v-model="linkBaseStyle.font">
                <el-option v-for="item in fontList" :key="item" :label="item" :value="item">
                </el-option>
              </el-select>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="dotted">
              <el-switch v-model="linkBaseStyle.dotted" active-color="#13ce66" inactive-color="#ff4949">
              </el-switch>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="lineDash">
              <el-select size="medium" style="width: 80px" v-model="linkBaseStyle.lineDash[0]">
                <el-option v-for="item in [1,2,3,4,5,6,7,8]" :key="item" :label="item" :value="item">
                </el-option>
              </el-select>
              <el-select size="medium" style="width: 80px" v-model="linkBaseStyle.lineDash[1]">
                <el-option v-for="item in [1,2,3,4,5,6,7,8]" :key="item" :label="item" :value="item">
                </el-option>
              </el-select>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="background">
              <el-color-picker v-model="linkBaseStyle.background">
              </el-color-picker>
            </el-form-item>
          </el-col>
        </el-row>
      </el-form>
    </div>

    <div class="super-flow-demo1">
      <div class="node-container">
        <span class="node-item" v-for="item in nodeItemList" @mousedown="evt => nodeItemMouseDown(evt, item.value)">
          {{ item.label }}
        </span>
      </div>
      <div class="flow-container" ref="flowContainer">
        <super-flow ref="superFlow" :graph-menu="graphMenu" :node-menu="nodeMenu" :link-menu="linkMenu"
          :link-base-style="linkBaseStyle" :link-style="linkStyle" :link-desc="linkDesc">
          <template v-slot:node="{meta}">
            <div @mouseup="nodeMouseUp" @click="nodeClick" class="flow-node ellipsis">
              {{ meta.name }}
            </div>
          </template>
        </super-flow>
      </div>
    </div>

    <el-dialog :title="drawerConf.title" :visible.sync="drawerConf.visible" :close-on-click-modal="false" width="500px">
      <el-form @keyup.native.enter="settingSubmit" @submit.native.prevent v-show="drawerConf.type === drawerType.node"
        ref="nodeSetting" :model="nodeSetting">
        <el-form-item label="节点名称" prop="name">
          <el-input v-model="nodeSetting.name" placeholder="请输入节点名称" maxlength="30">
          </el-input>
        </el-form-item>
        <el-form-item label="节点描述" prop="desc">
          <el-input v-model="nodeSetting.desc" placeholder="请输入节点描述" maxlength="30">
          </el-input>
        </el-form-item>
      </el-form>
      <el-form @keyup.native.enter="settingSubmit" @submit.native.prevent v-show="drawerConf.type === drawerType.link"
        ref="linkSetting" :model="linkSetting">
        <el-form-item label="连线描述" prop="desc">
          <el-input v-model="linkSetting.desc" placeholder="请输入连线描述">
          </el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="drawerConf.cancel">
          取 消
        </el-button>
        <el-button type="primary" @click="settingSubmit">
          确 定
        </el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import SuperFlow from 'vue-super-flow' 
import 'vue-super-flow/lib/index.css'
const drawerType = {
  node: 0,
  link: 1
}

export default {
  data() {
    return {
      drawerType,
      drawerConf: {
        title: '',
        visible: false,
        type: null,
        info: null,
        open: (type, info) => {
          const conf = this.drawerConf
          conf.visible = true
          conf.type = type
          conf.info = info
          if (conf.type === drawerType.node) {
            conf.title = '节点'
            if (this.$refs.nodeSetting) this.$refs.nodeSetting.resetFields()
            this.$set(this.nodeSetting, 'name', info.meta.name)
            this.$set(this.nodeSetting, 'desc', info.meta.desc)
          } else {
            conf.title = '连线'
            if (this.$refs.linkSetting) this.$refs.linkSetting.resetFields()
            this.$set(this.linkSetting, 'desc', info.meta ? info.meta.desc : '')
          }
        },
        cancel: () => {
          this.drawerConf.visible = false
          if (this.drawerConf.type === drawerType.node) {
            this.$refs.nodeSetting.clearValidate()
          } else {
            this.$refs.linkSetting.clearValidate()
          }
        }
      },
      linkSetting: {
        desc: ''
      },
      nodeSetting: {
        name: '',
        desc: ''
      },

      dragConf: {
        isDown: false,
        isMove: false,
        offsetTop: 0,
        offsetLeft: 0,
        clientX: 0,
        clientY: 0,
        ele: null,
        info: null
      },
      nodeItemList: [{
          label: '节点1',
          value: () => ({
            width: 120,
            height: 40,
            meta: {
              label: '1',
              name: '1'
            }
          })
        },
        {
          label: '节点2',
          value: () => ({
            width: 120,
            height: 40,
            meta: {
              label: '2',
              name: '2'
            }
          })
        },
        {
          label: '节点3',
          value: () => ({
            width: 120,
            height: 40,
            meta: {
              label: '3',
              name: '3'
            }
          })
        },
        {
          label: '节点4',
          value: () => ({
            width: 120,
            height: 40,
            meta: {
              label: '4',
              name: '4'
            }
          })
        }
      ],

      graphMenu: [
        [{
            // 选项 label
            label: '节点1',
            // 选项是否禁用
            disable(graph) {
              return !!graph.nodeList.find(node => node.meta.label === '1')
            },
            // 选项选中后回调函数
            selected(graph, coordinate) {
              graph.addNode({
                width: 120,
                height: 40,
                coordinate,
                meta: {
                  label: '1',
                  name: '1'
                }
              })
            }
          },
          {
            label: '节点2',
            selected(graph, coordinate) {
              graph.addNode({
                width: 120,
                height: 40,
                coordinate,
                meta: {
                  label: '2',
                  name: '2'
                }
              })
            }
          },
          {
            label: '节点3',
            selected(graph, coordinate) {
              graph.addNode({
                width: 120,
                height: 40,
                coordinate,
                meta: {
                  label: '3',
                  name: '3'
                }
              })
            }
          }
        ],
        [{
          label: '节点4',
          selected(graph, coordinate) {
            graph.addNode({
              width: 120,
              height: 40,
              coordinate,
              meta: {
                label: '4',
                name: '4'
              }
            })
          }
        }],
        [{
          label: '全选',
          selected: graph => {
            graph.selectAll()
          }
        }]
      ],
      nodeMenu: [
        [{
            label: '删除',
            selected: node => {
              node.remove()
            }
          },
          {
            label: '编辑',
            selected: node => {
              this.drawerConf.open(drawerType.node, node)
            }
          }
        ]
      ],
      linkMenu: [
        [{
            label: '删除',
            selected: link => {
              link.remove()
            }
          },
          {
            label: '编辑',
            selected: link => {
              this.drawerConf.open(drawerType.link, link)
            }
          }
        ]
      ],

      linkBaseStyle: {
        color: '#666666', // line 颜色
        hover: '#FF0000', // line hover 的颜色
        textColor: '#666666', // line 描述文字颜色
        textHover: '#FF0000', // line 描述文字 hover 颜色
        font: '14px Arial', // line 描述文字 字体设置 参考 canvas font
        dotted: false, // 是否是虚线
        lineDash: [4, 4], // 虚线时生效
        background: 'rgba(255,255,255,0.6)' // 描述文字背景色
      },
      fontList: [
        '14px Arial',
        'italic small-caps bold 12px arial'
      ]
    }
  },
  components: { SuperFlow },
  mounted() {
    document.addEventListener('mousemove', this.docMousemove)
    document.addEventListener('mouseup', this.docMouseup)
    this.$once('hook:beforeDestroy', () => {
      document.removeEventListener('mousemove', this.docMousemove)
      document.removeEventListener('mouseup', this.docMouseup)
    })
  },
  methods: {
    flowNodeClick(meta) {
      console.log(this.$refs.superFlow.graph)
    },
    linkStyle(link) {
      if (link.meta && link.meta.desc === '1') {
        return {
          color: 'red',
          hover: '#FF00FF',
          dotted: true
        }
      } else {
        return {}
      }
    },
    linkDesc(link) {
      return link.meta ? link.meta.desc : ''
    },
    settingSubmit() {
      const conf = this.drawerConf
      if (this.drawerConf.type === drawerType.node) {
        if (!conf.info.meta) conf.info.meta = {}
        Object.keys(this.nodeSetting).forEach(key => {
          this.$set(conf.info.meta, key, this.nodeSetting[key])
        })
        this.$refs.nodeSetting.resetFields()
      } else {
        if (!conf.info.meta) conf.info.meta = {}
        Object.keys(this.linkSetting).forEach(key => {
          this.$set(conf.info.meta, key, this.linkSetting[key])
        })
        this.$refs.linkSetting.resetFields()
      }
      conf.visible = false
    },
    nodeMouseUp(evt) {
      evt.preventDefault()
    },
    nodeClick() {
      console.log(arguments)
    },
    docMousemove({
      clientX,
      clientY
    }) {
      const conf = this.dragConf

      if (conf.isMove) {

        conf.ele.style.top = clientY - conf.offsetTop + 'px'
        conf.ele.style.left = clientX - conf.offsetLeft + 'px'

      } else if (conf.isDown) {

        // 鼠标移动量大于 5 时 移动状态生效
        conf.isMove =
          Math.abs(clientX - conf.clientX) > 5 ||
          Math.abs(clientY - conf.clientY) > 5

      }
    },
    docMouseup({
      clientX,
      clientY
    }) {
      const conf = this.dragConf
      conf.isDown = false

      if (conf.isMove) {
        const {
          top,
          right,
          bottom,
          left
        } = this.$refs.flowContainer.getBoundingClientRect()

        // 判断鼠标是否进入 flow container
        if (
          clientX > left &&
          clientX < right &&
          clientY > top &&
          clientY < bottom
        ) {

          // 获取拖动元素左上角相对 super flow 区域原点坐标
          const coordinate = this.$refs.superFlow.getMouseCoordinate(
            clientX - conf.offsetLeft,
            clientY - conf.offsetTop
          )

          // 添加节点
          this.$refs.superFlow.addNode({
            coordinate,
            ...conf.info
          })

        }

        conf.isMove = false
      }

      if (conf.ele) {
        conf.ele.remove()
        conf.ele = null
      }
    },
    nodeItemMouseDown(evt, infoFun) {
      const {
        clientX,
        clientY,
        currentTarget
      } = evt

      const {
        top,
        left
      } = evt.currentTarget.getBoundingClientRect()

      const conf = this.dragConf
      const ele = currentTarget.cloneNode(true)

      Object.assign(this.dragConf, {
        offsetLeft: clientX - left,
        offsetTop: clientY - top,
        clientX: clientX,
        clientY: clientY,
        info: infoFun(),
        ele,
        isDown: true
      })

      ele.style.position = 'fixed'
      ele.style.margin = '0'
      ele.style.top = clientY - conf.offsetTop + 'px'
      ele.style.left = clientX - conf.offsetLeft + 'px'

      this.$el.appendChild(this.dragConf.ele)
    }
  }
}
</script>

<style lang="less">
  .ellipsis {
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    word-wrap: break-word;
  }

  .link-base-style-form {
    .el-form-item {
      margin-bottom: 12px;
    }

    padding-bottom : 20px;
    border-bottom : 1px solid #DCDCDC;
  }

  .super-flow-demo1 {
    margin-top: 20px;
    width: 100%;
    height: 800px;
    background-color: #f5f5f5;
    @list-width : 200px;


    >.node-container {
      width: @list-width;
      float: left;
      height: 100%;
      text-align: center;
      background-color: #FFFFFF;
    }

    >.flow-container {
      width: calc(100% - @list-width);
      float: left;
      height: 100%;
      overflow: hidden;
    }

    .super-flow__node {
      .flow-node {
        box-sizing: border-box;
        width: 100%;
        height: 100%;
        line-height: 40px;
        padding: 0 6px;
        font-size: 12px;
      }
    }
  }

  .node-item {
    @node-item-height : 30px;

    font-size: 14px;
    display: inline-block;
    height: @node-item-height;
    width: 120px;
    margin-top: 20px;
    background-color: #FFFFFF;
    line-height: @node-item-height;
    box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    user-select: none;
    text-align: center;
    z-index: 6;

    &:hover {
      box-shadow: 1px 1px 8px rgba(0, 0, 0, 0.4);
    }
  }
</style>
